单项选择题

It is important to exclude any ________ illness that may be responsible for the fatigue.

A．underlining
B．underlying
C．fatal
D．incurable
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单项选择题
If payment is not received within five days, legal action will be our only ________.
A．selection
B．alternative
C．substitute
D．priority
单项选择题
My vacation ________ with yours, so we won't see each other for a month or so.
A．overturns
B．overtakes
C．overthrows
D．overlaps
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